Vacheron Constantin Overseas perpetual calendar ultra-thin skeleton

The Overseas perpetual calendar ultra-thin skeleton, reference 4300V/220R-B642, is a 41.5mm round case in rose gold with a blue dial and sapphire crystal. It is powered by the automatic Vacheron Constantin calibre 1120 QP and carries the Poinçon de Genève hallmark, a Geneva-based certification introduced in 1886 to denote quality craftsmanship in watchmaking. The watch features a perpetual calendar with date, month, year and moon phase indications, a display back, and water resistance to 50 metres.